Video instance shadow detection (VISD) is a new task, aiming not only to find shadows together with their associated objects in video frames but also to track each shadow, each object, and each shadow-object association in the video.
VISD has great potential to benefit many applications, ,
(i) instance copy-paste, in which we copy a shadow-object pair extracted from a video and paste it together into another (or the same) video;
Fig.  shows an example.
(ii) the vision system of autonomous driving, for which we can enhance its object awareness by considering the object shadows to help avoid blind-spot accidents when the object is occluded; and
(iii) video in-painting [1]}, [2]}, which obliterates the entire object by simultaneously accessing the object mask with the associated shadow mask.
